printbibliography output for "[author year] entrydata"

Question

I am using the following command for generating the bibliography in my scrreprt document

\usepackage[style=authoryear,backend=biber,sortlocale=de_DE,sorting=nty,maxbibnames=99,maxcitenames=1]{biblatex} %maxnames=bib&cite, maxbibname=bib, maxcitenames=cite, (default=3)

I am asked to print the bibliography in alphabetical order by last name of the first author or the publisher. It is more or less a harvard-style.

I cannot use style=alphabetic because the output would be the following

Instead I need the following

[Lui et al. 2017] J. Lui, H. Shen und L. Yu. ...

How can I achieve this?

Quickedit: I forgot to mention atleast the citestyle must be authoryear for references within the text

Answer 1

You could use my biblatex-ext style bundle (available in MikTeX and TeX live 2018 and above). Building on Adding an [AuthorYear] block at the beginning of bibliography entries, Creating a bibliography with fixed indention and authoryear labels using biblatex and biber and many related questions and answers those styles implement a introcite option.

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With introcite=plain you can get a similar output to Adding an [AuthorYear] block at the beginning of bibliography entries

\documentclass[british]{article}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage{babel}
\usepackage{csquotes}

\usepackage[style=ext-authoryear, backend=biber, introcite=plain, dashed=false]{biblatex}

\DeclareFieldFormat{bbx@introcite}{\mkbibbold{\mkbibbrackets{#1}}}
\renewcommand*{\introcitepunct}{\addspace}

\addbibresource{biblatex-examples.bib}

\begin{document}
\cite{sigfridsson,worman,geer,knuth:ct:a,knuth:ct:b}
\printbibliography
\end{document}

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With introcite=label you can get a more list-like output similar to Creating a bibliography with fixed indention and authoryear labels using biblatex and biber

\documentclass[british]{article}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage{babel}
\usepackage{csquotes}

\usepackage[style=ext-authoryear, backend=biber, introcite=label, dashed=false]{biblatex}

\DeclareFieldFormat{bbx@introcite}{\mkbibbrackets{#1}}
\setlength{\introcitewidth}{8\biblabelsep}
\setlength{\introcitesep}{.5\biblabelsep}

\addbibresource{biblatex-examples.bib}

\begin{document}
\cite{sigfridsson,worman,geer,knuth:ct:a,knuth:ct:b}
\printbibliography
\end{document}

The list indent and minimum space between the "label" and citation body can be controlled with \introcitewidth and \introcitesep. Labels that are too long move the reference to the next line.

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Edited for name changes in v0.4 of biblatex-ext.

Answer 2

The following MWE shows how to use \DeclareLabelalphaTemplate to achieve the desired customization of alphabetic bibliography style labels.

\documentclass{scrreprt}
\usepackage[style=authoryear,backend=biber,sortlocale=de_DE,sorting=nty,maxbibnames=99,maxcitenames=1,style=alphabetic]{biblatex} 

\addbibresource{\jobname.bib}
\usepackage{filecontents}
\begin{filecontents}{\jobname.bib}
@book{key,
  author = {Author, A. and Name, B.},
  year = {2001},
  title = {A long title to show the indentation of the second line},
  publisher = {Publisher},
}
\end{filecontents}
\renewcommand{\labelalphaothers}{\addspace et al.}
\DeclareLabelalphaTemplate[]{\labelelement{\field[names=1]{author}}
                             \labelelement{\literal{\addspace}}
                             \labelelement{\field{year}}
                             }

\begin{document}
\cite{key}
\printbibliography
\end{document}